Chelsea boss Thomas Tuchel admits Romelu Lukaku's miss could come back to haunt his side.
The Blues lost the first leg of their Champions League quarter-final 3-1 to Real Madrid at home.
They will now have to go to Real and win by two goals to force extra time, or win by three goals to secure the tie after 90 minutes.
Asked about Lukaku's header that went wide in the second half, Tuchel told reporters: "It was very important. There are no longer away goals so if we have only a one-goal deficit or a draw, then you see the momentum is back when we score. We could have even equalise. There were a lot of spaces and chances. But the individual decisions today were far from our level of standards.
"But yes, to come back with a chance like this at 3-2, after 16 shots in the second half alone, then goals are crucial. We didn't get them. We gave the third one away. It is simply impossible. We cannot demand that we turn it around if this is our foundation for this game."
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